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Atoms and Molecules (atoms (structure (proton (+), neutron (0, in the…
Atoms and Molecules
atoms
smallest particle of an element
makes up all matter
size
invisible to naked eye
0.0000000001m
representing
ball and stick
ball=atom
stick=bonds
circles
chemical symbols
different properties the way atoms are arranged
structure
proton
+
neutron
0
in the nucleus
electron
-
orbiting nucleus
atoms are neutral
atomic number
total number of protons
arranged in order of atomic number in periodic table
mass number
total number of protons and neutrons
molecules
made up of two or more chemically combined elements
elements
made of one type of element e.g. ozone
compounds
made up of a combination e.g. water
fixed ratio
chemical formula
letter-name
number-number of atom
order
in order of metal first, non-metal last
oxygen last
two types of elements
hydrogen first normally
